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Cook Mountain formation

Cook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.
StateMississippi
NameCook Mountain formation
Geologic ageEocene
Original map labelEcm
CommentsSecondary unit descriptions from USGS Lexicon website (MS002)and MS004: The Cook Mountain Formation is best exposed in Newton Co., MS, on the south side of I-20 at the Newton exit, in NW1/4NE1/4 sec. 26, T6N, R11E. Varies in thickness in the subsurface, from 47 ft to 135 ft. Thickens downdip. Mapped as a single unit, but two members discussed in text: Potterchitto and Gordon Creek Shale. Basal Archusa Marl Member is not recognized in Newton Co., either at the surface or in the subsurface. Disconformably overlies the Kosciusko Formation and conformably underlies the Cockfield Formation. Age is middle Eocene. Geologic map. Measured section. Stratigraphic column (Merrill and others, 1985).
Primary rock typeclay or mud
Secondary rock typesand
Other rock typeslimestone
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > SandCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.
Unconsolidated > MarlCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.
Minor
Unconsolidated > Fine-detrital > ClayCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.
Incidental
Sedimentary > Carbonate > LimestoneCook Mountain formation - (Claiborne group), Southeast of Pearl River, marl, limestone, glauconitic sand, and chocolate-colored clay; northwest of Pearl River, predominantly chocolate-colored clay with some glauconitic sand.
Map references
Moore, William Halsell, 1969, reprinted 1985, Geologic Map of Mississippi, Compiled by Bicker, A. R., Jr., a revision of the geologic map published by the MS Geological Survey in 1945 in cooperation with the USGS, revised from data submitted by Dr. E. E. Russell of MS State University from published reports of the MS Geological Survey and from field revisions, Mercury Maps Inc., Jackson, MS.
Unit references
Moore, William Halsell, 1969, reprinted 1985, Geologic Map of Mississippi, Compiled by Bicker, A. R., Jr., a revision of the geologic map published by the MS Geological Survey in 1945 in cooperation with the USGS, revised from data submitted by Dr. E. E. Russell of MS State University from published reports of the MS Geological Survey and from field revisions, Mercury Maps Inc., Jackson, MS.
USGS Geologic Names Lexicon (GEOLEX)
Merrill, R.K., Sims, J.J., Jr., Gann, D.E. and Liles, K.J., 1985, Newton County geology and mineral resources [Mississippi]: Mississippi Office of Geology Bulletin, no. 126, 108 p.
Geographic coverageCarroll - Clarke - Lauderdale

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